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dmorton replied to narwhal's discussion Polyurethane
"http://www.airtimekite.com/ sells bladders for kites.

Their Orange bladder material is an EVOH/LDPE laminate - very tough and light weight, and much easier to heat seal than PU. For making a long thin blimp - a hyperblimp - you could do worse than…"
Nov 6, 2012